gefran ADV200 User Manual

118 ADV200 • Functions description and parameters list
22.5 – FUNCTIONS/AC BRAKING
The AC braking is a technique of stopping the motor in a very efcient way for motors power up to 160 kW. Its
effectiveness is reduced with higher power ratings. Because the energy is dissipated as heat in the motor, It does
not replace the standard dynamic braking (braking chopper) or regenerative solutions, however, it can be used as
an alternative in certain applications such as fans and centrifugal.
The minimum deceleration ramp (stopping time) achieved depends on the load conditions, the operating conditions
(speed of the motor) and by the masses (total moment of inertia related to the motor shaft). The torque of the load,
for its braking action, can be taken into consideration as favourable for the motor to stop.
Note ! This feature is active on V/f control Regulation mode only. It is not recommended if the operitive conditions require frequent work-
ing duty Cycles.
Menu PAR Description UM Type FB BIT Def Min Max Acc Mod
22.5.1 2484 AC braking ENUM Disable 0 1 ERWZ _V_
This parameter enables/disables the function.
0 Disable
1 Enable
Setting the parameter to 0, AC Braking is disabled. Setting to 1 the parameter is enabled.
Menu PAR Description UM Type FB BIT Def Min Max Acc Mod
22.5.2 2486 AC brake Kp V/A FLOAT CALCF 0.0 100.0 ERWS _V_
This parameter denes the proportional gain of the PI controller used in the AC braking. Its value is based
on the motor data entered by the user and it is automatically calculated by the drive. Increasing manually the
obtained value, it increases its execution but could cause motor speed oscillations.
Menu PAR Description UM Type FB BIT Def Min Max Acc Mod
22.5.3 2488 AC brake Ti ms FLOAT CALCF 1.0 1000.0 ERWS _V_
This parameter denes the value of the integral component of the PI controller used in the AC braking. Its value
is based on the motor data entered by the user and it is automatically calculated by the drive. Reducing manu-
ally the obtained value, it increases its execution but could cause motor speed oscillations.
Menu PAR Description UM Type FB BIT Def Min Max Acc Mod
22.5.4 2478 AC brake active ref perc FLOAT -2 -10 10 ERWS _V_
This parameter denes the threshold value of the active component of the motor current to below which ena-
bles the function to dissipate as heat the energy regenerated by the motor during its deceleration. It is dened
as a percentage of the rated drive current. Values close to zero or greater than zero anticipate the intervention
of the braking and increase the dissipation of energy, but can generate unnecessary activations in conditions of
zero load or light load. Values less than zero produce the opposite effect.
Application Example:
The following example is referred to a constant torque application. The values used allow to roughly calculate
the minimum ramp braking time (decTime) using the AC Braking function.
Necessary Data:
P
n
Motor Nominal Power
ω
max
Max Motor Speed
ω
0
Initial braking Speed
η
mot
Motor Efciency
η
inv
Inverter Efciency
J Total moment of inertia related to the motor shaft
T
load
Torque value of the applied Load

gefran ADV200 Specifications

General

Brand	gefran
Model	ADV200
Category	Inverter
Language	English